Well…
That’s a bit complicated…
First off, the points system hasn’t been reinstated yet (and probably won’t be).
Originally, the point systems was based on number of posts (one point per post) that a member would submit, as well as just logging on (one point per day). But that lead to spam posting by members to quickly increase their rank. So the point per post part was done away with.
Points were also given for participation in polls and trivia.
As for the ranks:
Captain - Site Administrators
Commander - Site Moderators
Lt. Commander - Manual promotion for members who have shown themselves to be dedicated fans and helpful to the site and members.
Lieutenant (This was the highest rank that you could achieve under the points system, barring manual promotion to Lt. Commander, or becoming a Site Moderator)
Master Chief Sargent
Master Sargent
Sergant
Corporal
Private 1st Class
Private
(Edit: Forgot one of the ranks, and added a bit more information.)
(Edit II: Fixed spelling mistakes, and one of the ranks.)